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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
14/12/1999 |
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Data da última atualização: |
14/12/1999 |
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Autoria: |
GOEDERT, C. O. |
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Título: |
Seed dormancy of tropical forage grasses and implications for the conservation of genetic resouces. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Reading: University of Reading, 1984. |
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Páginas: |
190p. |
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Idioma: |
Inglês |
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Notas: |
PhD.Thesis. |
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Conteúdo: |
Investigations are described on the characteristics of tropical grass seeds which affect their management, particularly in genebanks. Five tropical forage grass species were selected for study - Brachiaria humidicola, Brachiaria decumbens, Panicum maximum, Paspalum guenoarum and Andropogon gayanus. It is shown that germination tests currently provide the best basis for monitoring viability. However two problems are particularly prevalent in tropical grasses which hinder the interpretation of germination tests: first, freshly harvested 'seeds' often show low purity (i.e. a high proportion of immature and empty spikelets); and secondly, many of the true seeds often show pronounced dormancy (i.e. though viable they are incapable of germination without special stimuli). Investigation of the purity problems showed that it can be overcome with the use of X-ray equipment, but other methods are unreliable. Investigation of the dormancy problem led to the conclusion that advantage needs to be taken of the interaction of several dormancy-breaking agents. It is shown that simultaneous use of three of these are specially valuable-alternating temperatures, light and nitrate ions. In particular it is important to define the optimum characteristics of alternating-temperature regimes for maximum stimulation of germination. Techniques for doing this were developed using a two-way temperature-gradient plate. Aplitude and thermoperiod were both shown to be particularly important attributes and, although the optima for each species investigated differed in detail, in no case did any optimum diverge far from a regime in which seeds were subjected to diurnal cycles of 20h at 15º and 4h at 35ºC in the presence of 10-2 M KNO3 and intermittent illumination. The significance of these and other experimental results are discused in relation to seed physiology and to problems of the management of seed accessions in genebanks for genetic conservation. MenosInvestigations are described on the characteristics of tropical grass seeds which affect their management, particularly in genebanks. Five tropical forage grass species were selected for study - Brachiaria humidicola, Brachiaria decumbens, Panicum maximum, Paspalum guenoarum and Andropogon gayanus. It is shown that germination tests currently provide the best basis for monitoring viability. However two problems are particularly prevalent in tropical grasses which hinder the interpretation of germination tests: first, freshly harvested 'seeds' often show low purity (i.e. a high proportion of immature and empty spikelets); and secondly, many of the true seeds often show pronounced dormancy (i.e. though viable they are incapable of germination without special stimuli). Investigation of the purity problems showed that it can be overcome with the use of X-ray equipment, but other methods are unreliable. Investigation of the dormancy problem led to the conclusion that advantage needs to be taken of the interaction of several dormancy-breaking agents. It is shown that simultaneous use of three of these are specially valuable-alternating temperatures, light and nitrate ions. In particular it is important to define the optimum characteristics of alternating-temperature regimes for maximum stimulation of germination. Techniques for doing this were developed using a two-way temperature-gradient plate. Aplitude and thermoperiod were both shown to be particularly important attributes and... Mostrar Tudo |
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Palavras-Chave: |
Feed grasses; Plant physiolofy; Rescurso genetico; Resource conservation; Tropical crops. |
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Thesagro: |
Dormência da Semente; Fisiologia Vegetal; Gramínea Tropical; Planta Forrageira. |
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Thesaurus Nal: |
dormancy; genetic resources; seeds. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02734nam a2200277 a 4500
001 1559470
005 1999-12-14
008 1984 bl uuuu m 00u1 u #d
100 1 $aGOEDERT, C. O.
245 $aSeed dormancy of tropical forage grasses and implications for the conservation of genetic resouces.
260 $aReading: University of Reading$c1984
300 $a190p.
500 $aPhD.Thesis.
520 $aInvestigations are described on the characteristics of tropical grass seeds which affect their management, particularly in genebanks. Five tropical forage grass species were selected for study - Brachiaria humidicola, Brachiaria decumbens, Panicum maximum, Paspalum guenoarum and Andropogon gayanus. It is shown that germination tests currently provide the best basis for monitoring viability. However two problems are particularly prevalent in tropical grasses which hinder the interpretation of germination tests: first, freshly harvested 'seeds' often show low purity (i.e. a high proportion of immature and empty spikelets); and secondly, many of the true seeds often show pronounced dormancy (i.e. though viable they are incapable of germination without special stimuli). Investigation of the purity problems showed that it can be overcome with the use of X-ray equipment, but other methods are unreliable. Investigation of the dormancy problem led to the conclusion that advantage needs to be taken of the interaction of several dormancy-breaking agents. It is shown that simultaneous use of three of these are specially valuable-alternating temperatures, light and nitrate ions. In particular it is important to define the optimum characteristics of alternating-temperature regimes for maximum stimulation of germination. Techniques for doing this were developed using a two-way temperature-gradient plate. Aplitude and thermoperiod were both shown to be particularly important attributes and, although the optima for each species investigated differed in detail, in no case did any optimum diverge far from a regime in which seeds were subjected to diurnal cycles of 20h at 15º and 4h at 35ºC in the presence of 10-2 M KNO3 and intermittent illumination. The significance of these and other experimental results are discused in relation to seed physiology and to problems of the management of seed accessions in genebanks for genetic conservation.
650 $adormancy
650 $agenetic resources
650 $aseeds
650 $aDormência da Semente
650 $aFisiologia Vegetal
650 $aGramínea Tropical
650 $aPlanta Forrageira
653 $aFeed grasses
653 $aPlant physiolofy
653 $aRescurso genetico
653 $aResource conservation
653 $aTropical crops
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 56 | |
| 6. |  | GOEDERT, C. O. Temperatura do planossolo em Pelotas, Rio Grande do Sul. Pesquisa Agropecuária Brasileira, Rio de Janeiro, v. 6, p. 9-16, 1971. (Agronomia, 4). Título em inglês: Planosol temperature in Pelotas, Rio Grande do Sul, Brazil.
A partir do v. 3(1968) é constituída de duas partes: Série Agronomia e Série Veterinária, publicadas também separadamente.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 9. | | GOEDERT, C. O. Rede Nacional de Recursos Genéticos - Brasil. In: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía, 2005. p. 29.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 14. | | SILVA, R. C.; GOEDERT, C. O. Conservação a longo prazo de germoplasma semente de cevada (Hordeum vulgare L.). In : ENCONTRO DO TALENTO ESTUDANTIL DA EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA, 12., 2007, Brasília, DF. Anais: resumos dos trabalhos. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2007. p. 194. Disponível também em: SIMPÓSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 6., 2007, Chapingo, México. Por la valoración de los recursos genéticos para el desarrollo sustentable en América Latina y el Caribe: memoria....| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 19. | | GOEDERT, C. O.; WETZEL, M. M. V. S. Banco de cultivares de EMBRAPA - BCE. In: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía, 2005. p. 28.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| 20. | | WETZEL, M. M. V. da S.; GOEDERT, C. O.; PEREIRA NETO, L. G. Coleção de base de germoplasma da EMBRAPA. In: SIMPOSIO DE RECURSOS GENÉTICOS PARA AMÉRICA LATINA Y EL CARIBE, SIRGEALC, 5., 2005, Montevideo, Uruguay. Resúmenes... Montevideo: Instituto Nacional de Investigación Agropecuaria: Universidad de la República, Facultad de Agronomía, 2005. p. 34.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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| Registros recuperados : 56 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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